Energy efficient micro combustion system for power generation and fuel processing
View Patent ↗An integrated micro-scale power converter converts hydrocarbon fuel into electricity. The integrated micro-scale power converter includes a micromachined combustor adapted to convert hydrocarbon fuel into thermal energy and a micromachined thermoelectric generator adapted to convert the thermal energy into electrical energy. The combustion reaction in the combustor flows in a path in a first plane while the thermal energy flows in a second plane in the generator the second plane being nearly orthogonal or orthogonal to the first plane. The fuel handler in the combustor is adjacent and thermally isolated from the thermoelectric generator. The fuel handler may include a nozzle and gas flow switch, where the frequency of activation of the gas flow switch controls the amount of the fuel ejected from the nozzle.
1. A micro-scale system comprising:
a fuel handling chip fabricated using a semiconductor wafer processing technique;
a power generation chip comprising a combustion chamber, fabricated on a substrate using a semiconductor wafer processing technique;
a thermoelectric generator element having a hot end and a cold end deposited and fabricated on the substrate using a semiconductor wafer processing technique;
the power generation chip configured whereby a combusted product gas exiting through an outlet located on top of the combustion chamber is routed to flow in reverse and parallel to a fuel inlet direction into an expansion nozzle.
2. The micro-scale system of claim 1 wherein the fuel handling chip and the power generation chip are thermally isolated from each other.
3. The micro-scale system of claim 1 wherein the fuel handling chip uses a fuel capillary force and a pressurized gas to control a fuel flow rate to a fuel injector nozzle.
4. The micro-scale system of claim wherein the hydrocarbon fuel flow rate through the nozzle is controlled by an electrostatic actuated fluid switch.
5. The micro-scale system of claim 1 , wherein a capillary force is used to transport fuel from a fuel source to the power generation chip.